Combined thermometer-hygrometer gauge unit



FIG. 1 is a right front perspective view of a combined thermometer-hygrometer gauge unit showing my new design;

FIG. 2 is a top plan view thereof, the bottom plan being a mirror image thereto;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a right side elevational view thereof, the left side being a mirror image thereto;

FIG. 5 is a rear elevational view thereof. 

The ornamental design for a combined thermometer-hygrometer gauge unit, as shown and described. 